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Thread: Math Trouble

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    April's Avatar
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    Math Trouble

    This may be a stupid question but........Im trying to figure out how many gallons are in my friends pool that I'm helping her slam. I thought I could figure it out by how many gallons of chlorine I had added to get her to her slam level but math is not my strong point. So any help is appreciated.

    She thinks the size is a 20x40 IG Grecian. Shallow end is 4' deep end is 8'. But she is not positive.

    So I added:
    4 gallons of chlorine 10%
    Raised her FC to 13.

    Is it possible to figure out the gallons this way?
    18ft Round AG, Vinyl, 100LB Pentair Sand Filter, 1HP, June 2012, TF-100 w/SpeedStir

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    Mod Squad jblizzle's Avatar
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    Re: Math Trouble

    Not very exactly. Since you do not know the exact strength of the bleach.

    Assuming it is really 10% and you started at 0ppm ... PoolMath estimates it would be 31k gallons.
    Although using the volume calculator, it could be a little more than that if the dimensions are correct.
    Jason, TFP Moderator
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    Divin Dave's Avatar
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    Re: Math Trouble

    Hi April,

    For calculating how many galollons in a pool (or any other rectanular or square container)
    the formula is L*W*D = cubic feet of volume

    There is 7.47 gallons in 1 Cubit Foot of water - so,
    Gallons = Cubic Feet * 7.47

    Or - why not just use pool math to help you?
    Towards the bottom of pool math is a volume calculator.
    Just measure the length and width of the pool. For the depth, do an average. Deep End + Shallow end divided by 2.

    Or, you can play around with pool math by changing the volume and using the 4 gallons raising the FC to 13 and nail it that way.
    http://www.troublefreepool.com/calc.html


    If you want to calculate the pool volume chemically, then here is the best way to do it. (this should impress your friend!)
    A Chemical Way of Calculating Pool Volume

    hope this helps,
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    April's Avatar
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    Re: Math Trouble

    Thank you Jason and Dave.

    I didn't know if pool math would be correct because the sides of the pool slope in. Like this \_/.
    18ft Round AG, Vinyl, 100LB Pentair Sand Filter, 1HP, June 2012, TF-100 w/SpeedStir

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    Divin Dave's Avatar
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    Re: Math Trouble

    Yup,
    it does account for the slope. to some extent. Not all pools will be exactly equal slopes though, but pool math should easily get you within a few hundred gallons.
    Its easy enough to tweak it from there.

    Quote Originally Posted by April View Post
    Thank you Jason and Dave.

    I didn't know if pool math would be correct because the sides of the pool slope in. Like this \_/.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    mas985's Avatar
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    Re: Math Trouble

    Just to be precise, there is 7.48 gallons/cu-ft.
    Mark
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  7. Back To Top    #7
    April's Avatar
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    Re: Math Trouble

    Thank you everyone. I'll use 28k to start out with and adjust from there.
    18ft Round AG, Vinyl, 100LB Pentair Sand Filter, 1HP, June 2012, TF-100 w/SpeedStir

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